Set element and pipeline of RTSPMedia correctly
Fixed Gst.Iterator.find_custom

Requires patch from https://bugzilla.gnome.org/show_bug.cgi?id=685231
Fixed errors with owned/unowned variables
Adapted to API changes in gst-rtsp-server from master
Use tsparse instead of mpegtsparse

mpegtsparse was removed in Gst-1.0, however tsparse in its current state does not support parsing DVB-specific tables such as NIT or EIT.